GuitarJack Advantages:GuitarJack Model 2 has several advantages over many other audio accessories, including stereo mic/line-input, configurable Hi-Z or Lo-Z 1/4" instrument input, simultaneous instrument and microphone recording with both inputs when used with apps like FourTrack and StudioTrack that support those features, software controllable input level control with 60 dB of gain plus 12 dB pad for 72 dB of adjustment, device powered for ultimate portability, stereo line out/headphone jack with more drive than the iPhone built-in headphone jack, a 24-bit AD/DA converter, the highest quality sound, works with Lightning and 30-pin iOS devices, and it is made in the U.S.A using high quality components.